Most Common Check Engine Codes
Random/Multiple Cylinder Misfire Detected
Catalyst System Efficiency Below Threshold (Bank 1)
System Too Lean (Bank 1)
Evaporative Emission Control System Leak Detected (Small Leak)
Evaporative Emission Control System Leak Detected (Large Leak)
Coolant Temperature Below Thermostat Regulating Temperature
Cylinder 1 Misfire Detected
Cylinder 2 Misfire Detected
System Too Lean (Bank 2)
Exhaust Gas Recirculation Flow Insufficient Detected
Camshaft Position Sensor Circuit Malfunction (Bank 1)
Crankshaft Position Sensor Circuit Malfunction
Transmission Control System Malfunction
Idle Control System Malfunction
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)
Catalyst System Efficiency Below Threshold (Bank 2)
Evaporative Emission Control System Vent Control Circuit Malfunction
Idle Control System RPM High
Knock Sensor 1 Circuit Malfunction (Bank 1)
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How It Works
Use an OBD-II scanner on your vehicle's diagnostic port to read the fault code.
Search for your code above. Get the meaning, causes, and step-by-step diagnostics.
Follow the diagnostic steps or take the info to your mechanic for a faster, cheaper repair.
About Car Code Finder
Car Code Finder is a free OBD-II diagnostic code reference for vehicle owners and mechanics. Each code page includes a plain-English explanation, ranked probable causes, step-by-step diagnostic procedures with specific measurements, common affected vehicles, and realistic repair cost estimates.
All codes follow the SAE J2012 standard. Generic (P0xxx) codes apply to all makes and models. Manufacturer-specific codes (P1xxx, P2xxx, P3xxx) may vary by vehicle. Body (B), chassis (C), and network (U) codes cover non-powertrain systems like airbags, ABS, and CAN bus communication.